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| Research on the Establishing Scheme of Local Time Standard |
| HUANG Yan1,ZHANG Han1,GAO Yuan2 |
1.Beijing Institute of Metrology, Beijing 100029, China;
2. National Institute of Metrology, Beijing 100029, China |
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Abstract To test satellite navigation products, the establishing scheme of local time standard steered by national time standard is proposed. The scheme establishes a GPS common-view time transfer system, traces the local atomic clock to UTC(NIM) by data comparison, filters data by Vondrak method and abandons abnormal data. The scheme determines that can influence the comparison accuracy, including that the ionosphere delay real-time values observed at two frequencies is revised, the antenna coordinate is set to base mode, and the data with elevations above 30° are selected, so the comparison accuracy can be improved. A predict equation is solved, and the real-time value transfer is ultimately implemented. Experiments show that local time standard and national time standard synchronize within ±10ns, and the accuracy and stability are improved.
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2015, Vol. 36 
